Two single-ply yellow PVC vinyl coated polyester fabric plies protecting an insulation barrier reinforced with a spring steel wire helix & black external PVC wearstrip. Insulation; 1-inch fiberglass insulation (R-Value=4). Ideal use for both permanent & mobile air conditioning applications. PVC material resists ozone, UV rays, & moisture. Compressibility allows for convenient storage. Wearstrip offers additional external abrasion & drag resistance. Other Arctic Duct constructions available. Manufactured with flame retardant materials. Made with sewn cuff on each end.